Garmin GTX 320 Pilot El Kitabı - Sayfa 3

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Any time the function switch is in the ON or ALT position the transponder becomes an active part

of the beacon system. Select ON or ALT as late as practical prior to takeoff and switch to OFF or SBY

as soon as practical after completing landing roll unless the change to SBY has been accomplished

previously at the request of ATC.

Code Selector

The code selector consists of four, eight position switches that provide 4,096 active identification

codes. Attention should be paid to the selected identification code. The selected code should be in

accordance with instructions for IFR flight or rules applicable to transponder utilization for VFR

flight.

When making routine code changes, you should avoid inadvertent selection of codes 7500, 7600,

or 7700 thereby causing momentary false alarms at automated ground facilities. For example when

switching from code 2700 to code 7200, switch first to 2200 then 7200, NOT to 7700 and then

7200.

This procedure applies to nondiscrete code 7500 and all discrete codes in the 7600 and 7700 series

(i.e., 7600-7677, 7700-7777) which trigger special indicators in automated facilities. Only nondis-

crete code 7500 will be decoded as the hijack code. An aircraft' s transponder code (when available)

is utilized to enhance the tracking capabilities of the ATC facility, therefore you should not turn the

GTX 320 to SBY when making routine code changes.

Important Codes

• 1200—The VFR Code for any altitude.

• 7600—Loss of Communications.

• 7500—Hijacking (Never assigned by ATC without prior notification of the pilot that his or

her aircraft is subject to unlawful interference).

• 7700—Emergency (All secondary surveillance radar sites are ready to receive this code at all

times).

See the Airman' s Information Manual (AIM) for a detailed explanation of identification codes.

IDENT Button

On occasion, the controller will request "SQUAWK IDENT". Respond by momentarily pressing and

releasing the IDENT button. Pressing the IDENT button activates the Special Position Identification

Pulse (SPI) for approximately 20 seconds identifying your transponder return from other aircraft on

the controller' s scope.

Reply Light

The reply light will blink each time the transponder replies to ground interrogation. The reply light

remains lit up during the IDENT time interval.